Unknown Armies is a 4-book series with 13 primary works first released in 1999 with contributions by Greg Stolze, J. Tynes, Chad Underkoffler, Ted Cabeen, Lisa Padol, James Palmer, John Snead, Tim Toner, Ian Young, Michael Daisey, Tim Dedopulos, Kenneth Hite, Joshua Kronengold, Daniel Ksenych, Nicole Lindroos, Michael D. Mearls, Rick Neal, and John Tynes.